Combined telephone and phonograph



' Oct. 19, 1943.

H. R. VA'N DEVENTER 2,332,359 I COMBINED TELEPHONE AND PHONOGRAPH FiledSept. 26, 1941 3 Sheets-Sheet 1 'ATTORNEYS Oct. 19, 1943. H. R. VANDEVENTER COMBINED TELEPHONE AND PHONOGRAPE 5 Sheets-Sheet 2 Filed Sept.26, 1941 ddc/J INVENTOR Homer A? hm/flzm-A/rm ATTORNEYS Oct. 19, 1943.H. R. VAN DEVENTER COMBINED TELEPHONE AND PHONOGRAPH Filed-Sept. 26,1941 3 Sheets-Sheet 3 IN VENTO R finer/P. Mm/fiwmrm BY 14W, 5 5% ATTO RN EYS Patented Oct. 19, 1943 UNITED. STATES PATENT OFFICE COIWBINEDTELEPHONE AND PHONOGKAPH Harry R. Van Deventer, New York, N. Y.,assignor,

by mesne assignments, to Telephone Answering and Recording Corporation,New York, N. Y., a corporation of Delaware Application September 26,1941, Serial N 0. 412,409

33 Claims.

This invention relates to a telephone system wherein phonographs may beused at the subofice and under the control of an operator thereat.

A further object is to provide in the system of the class described aphonograph located at a sub-station and controlled by the ringer of thesub-set.

Other objects and some of the advantages of controlled over the.telephone lines to which they are connected by means located at thecentral the invention will be apparent from a perusal of the followingspecification where, byway of illustration, a preferred embodiment ofthe invention is disclosed. It will be obvious, however, that This canbe ,once the inventive concept is understood, that.

ers line, but obviously if the subscriber is absent the starting andstopping of the phonograph must be taken care of automatically, asdisclosed in pending U.'S. application Serial No. 333,268., filed May 4,1940, now Patent No. 2,261,420, dated Nov. 4, 1941. Instead, thephonograph may; be controlled from the central ofiice, in which case itis highly desirable that the standard equipment commonly found inthe'central oflice and used in connection with the operation of thetelephone system can be employed. The following specification discloseshow this can be accomplished.

Referring now to the drawings:

Figure 1 is a schematic diagram of the circuits in a common batterytelephone exchange, to which telephone and phonograph equipment may beconnected and operated;

Figure 2 is a circuit diagram of a condenser as used in the system;

Figure 3 is a front View of a ringer equipped with circuit controlcontacts;

Figure 4 is a sectional view of the ringer on the line 44 of Figure 3;

Figures 5 to 10, inclusive, are circuit diagrams of a combined telephoneand phonograph substation equipment; and

Figure 11 is a diagram of connections of a combined telephone andphonograph equipment.

In Figure 1 no attempt has been made to show these circuits in detail,and only suflicient of the circuits and apparatus have been shown toenable one skilled in the art to properly understand the operation ofsaid circuits in connection with operating phonographs by remotecontrol. It will be understood that the central office equipment -may beof any known character; usually in such exchanges there are a pluralityof signaling devices. In the figure these comprise the usual fourringing keys commonly employed with systems of harmonic ringing wherefour frequencies are provided-usually of 16 33 50, and 66 cycles,respectively, these frequencies being supplied by ringing machines orinterrupters so that when the operator depresses one of the ringingkeys, ringing current will be applied to the called subscribers line fora predetermined period followed by a silent period. These four currentsas just described constitute a plurality of signaling means, and arehereinafter referred to as such, and for further description of suchharmonic party line systems reference is made to Page 423 ofTelephonology by H. R. Van Deventer, Bubliszllied by McGraw-Hill BookCo., New York, in 19 2.

It will be understood, however, that the plurality of signaling meansmay comprise some other signaling means thanthe harmonic frequenciesjust described. It may comprise the line-to-ground-system disclosed onpage .175 of Telephonology above referred to, or thedirectcurrent-pulsating-biased-bell-system referred to on page 179 ofTelephonology, or the high and low frequency system referred to on pageof Telephonology, or in fact, any system in which there are a-pluralityof signaling means at the central station" adapted either'by differencein the characteristics of the signaling current, or a difference in thestrength and/or polarity thereof, or by reason of a diiference in anyother manner, to enable such sources to selectively operate signal meanslocated at the sub-sets. Therefore, the inventive concept hereindisclosed comprisesthe utilization of whatever signaling means ispresent in the exchange to either ring the bell at the sub-set oroperate, or start, or stop a phonograph instrument located thereat.

Referringto Figure 1, it will be observed that no special apparatus isnecessary at the exchange, the circuits shown being of the general typein extended use for manyyears.

Referring to Figure l,-the numeral II] denotes a subscribers linehereinafter termed the calling line, and II and l I the wires of asubscribers line hereinafter termed the called line. The line andcut-off relays, line lamp and associated equipment is omitted inconnection with line i0, but these parts are shown in connection withthe called line I I I. It will be understood that line H) has the sameequipment and that it operates in the usual way.

The operator's cord circuit is of any type and the various parts andtheir operation is well known.

Assuming that the calling line It) has called: The operator places theanswering plug i2 in a jack of line H, H, depresses the listening key l3and answers the call in the usual manner; upon being told that line H,H, is wanted, the operator then places the calling plug M in jack II anddepresses the proper ringing key, say l5, thereby connecting |6 cycleringing current to the called line via the plug l4. If machine ringingis used to operate the ringer at the telephone instrument |6 connectedto the called line, it will ring at intervals until the calledsubscriber answers, whereupon the supervisory lamp I! in the callingcord will be extinguished.

If th called line is equipped with a phonograph, the jack or jacksconnected thereto at the central office will be suitably marked as shownat |8, which the operator notes when making the connection, and shouldthe called subscriber fail to answer, the supervisory lamp I! soindicating, the operator may then notify the calling subscriber bydepressing the listening key I3 and saying: They do not answer, butthere is a recording phonograph connected to the telephone and if youwish to leave a message, I will connect you; and if the callingsubscriber so desires, the operator then depresses one of the ringingkeys,-say W' -thereby connecting the 66 cycle ringing current to line H(any frequency can be used except that used to operate the ringer 20 attelephone l6, as just described). The 66 cycle current flowing in thecircuit of the called line will operate the relay l9 responsive to thiscurrent only, and unafiected by the current used to operate the ringer20.

When relay i9 closes contacts I9 IS", a circuit is established from thesource of alternating current 23 (which may be the usual house lightingcircuit), via conductor 24, winding 25 of a control relay 25, contacts2|, 22, through contacts 26, 21, of cam switch 38, via contacts 28, 29,on ringer 20 to the other side 3|] of the source of current 23 (one sideof the A. C. source of current 23 is shown grounded at merely tosimplify the diagram).

The relay contacts 2|, 22, also close a. circuit through the phonographmotor 3| which begins operation.

Relay 25 has an additional pair of normally open contact 32, 33, whichcomplete a circuit from line II, II, through one winding 34 of arepeating coil, the other winding 35 of which is connected to the inputand/or output circuits of the phonograph driven by motor 3|. As thewinding 34 forms a path for direct current from line H to ll, thesupervisory relay 36 in the calling cord will operate and extinguish thesupervisory lamp H. The supervisory lamp 3! in the answering cord isextinguished as the calling subscriber on line II! has the receiver offthe hook. Thus both supervisory lamps in the cord circuit areextinguished during the operation of the phonograph.

The calling subscriber now speaks the message he wishes to record, andthe voice currents travel in the usual manner over line it], through theconnecting cord circuit and via line II, H through the winding 34 of therepeating coil and via winding 35 to the talking circuit of thephonograph. These circuits (not shown) contain the usual recording andreproducing means such, for example, as an amplifier and a cutter andpickup, acting in the usual way to record and reproduce speech upon therecord being driven by the motor 3|. While these talking circuits couldbe connected directly to the line wires II, H it is preferable to use arepeating coil so that the circuits can be properly matche forimpedance, etc.

When the calling subscriber on line If) hangs his receiver on the hook,thus operating the supervisory relay in the answering side of the cordcircuit, supervisory lamp 3! will be illuminated and the operator knowsthe recording is completed. The operator thereupon depresses key I5,thus sending 16 cycle current out over line II, II. This operates theringer 20 and opens contacts 28, 29, thereby opening the circuit throughthe winding 25 of relay 25 which opens the two sets of contacts 2|, 22and 32, 33. The latter contacts open the circuit through the repeatingcoil winding 34, which releases the supervisory relay 36 in the callingside of the cord circuit and illuminates the supervisory lamp therebynotifying the operator that the phonograph has been disconnected fromthe line The contacts 2|, 22, open the circuit through the phonographmotor 3|, which ceases operation.

Thus a number of short messages can be recorded on the phonographrecord. Such 8" records will record a total of about five-and-one-half(5 /2) minutes conversation. Should the end of the record bereached, thecam switch 38 controlling normally closed contacts 26, 27, operated atthe proper time by motor 3|, will open the circuits from the A. C.source 23 through the motor 3| and the winding 25 of relay 25, thusdisconnecting the motor and opening all contacts on relay 25. This opensthe circuit through winding 34 on the repeating coil and operates thesupervisory lamp i1.

The contacts 26, 21, may be so arranged that once opened, they willremain open until the cutter arm is moved, which it is necessary to doto place a new record blank on the phonograph. A detailed description ofthe operation of such a cam switch is given in the co-pendingapplication before mentioned.

It will be noted that the normal operation of ringer 20 does not affectthe operation of the phonograph which does not operate until relay 25 isoperated. After the phonograph is started by relay 25, it may then bestopped by the actuation of the ringer 20. Thus the operator at thecentral office can stop and start the phonograph at will except when therecord is exhausted and cam switch 38 is operated, at which time itwould be impossible to start the phonograph until a record blank isplaced thereon.

Also it will be observed that the operation of the phonograph does notaffect the telephone l6.

- Should the subscriber here wish to answer while Condensers 39, 40, areplaced in series with relay I9 and ringer 20 to render these opaque todirect current. If desired, these condensers can be combined into onethree-plate condenser as shown at 4| in Figure 2, thus saving in spaceand equipment.

The contacts 28, 29, may be built into the usual telephone ringer, orcan be applied thereto by means of an attachment constituting a circuitcontrolling device, as shown in Figures 3 and 4, wherein 2i) denotes thehammer of a ringer adapted to strike gongs 42, 43.

Suitably mounted on the frame of the ringer is the yoke 44 which isbiased, as shown by spring 45 and operates the contacts 28, 29, 41. Whenthe hammer is operated,the yoke is moved about the pivot 46 to cause oneof the contact springs 29 to leave the contact 28, thus opening thecircuit between 28 and 29, which circuit is normally closed.

If a make contact is desired, it is provided 'at 4'! and then when theringer operates, a circuit is made between 29 and 41 for purposeshereinafter described in connection with Figure 10. The contacts can, ofcourse, be operated by the armature 20 of the ringer, or in any othermanner by the operation thereof, the showing in Figures 3 and 4 beingmerely illustrative of the broad idea.

Figure 6 shows an alternate form of operating circuit for thephonograph. Here the ringer 20R has two armatures 48, 49, the formercarrying the bell hammer 20 and being responsive to a certainfrequencysay 16 cycles-and the other responsive to some otherfrequency-say 66 cycles. The operation of this circuit is in allrespects identical with that shown in Figure 5, except relay I9 in saidfigure is omitted.

Figure 7 shows an alternate form of operating circuit for thephonograph. Here the ringer 20 has in a normally closed circuit with itscontacts, the winding of a holding relay 50 and the low-voltage winding5| of a transformer, the other winding of which is connected to a sourceof A. current as shown. When the ringer 20 is operated, opening itscontacts 28, 29, the relay 50 closes its contacts 52, 53. This completesa circuit from theA. 0. current source 23 through the heater coil 54 ofa thermal relay having the normally open contacts 55, 56. adjusted thatit will not close its contacts except after a predetermined number ofmachine ringing periods of current application have been made to ringer29, which controls the circuit therethrough. In other words, thiscomprises a time delay mechanism and the operator can 011- erate theringer 29 in the usual manner for a period ofsay one-half /2) minute,without it applying sufiicient current to the coil 54 to cause contacts55, 56, to close. This enables the operator to operate the ringer 23 inthe sub-set in the usual way.

.But if the called subscriber does not answer,

. the operator may so inform the calling subscriber,

and then if he desires to record, the operator again applies ringingcurrent to ringer 2Ilior a sufilcient time to cause coil 54 to heat upand close its contacts. This operates the relay 25 which via contacopens the circuit through coil 54. Relay 25 locks itself in circuit withthe current supply 23 as shown, via contact 58; armature 59 and contacts60 and GI and the contacts 26, 21, of cam switch 38, thus starting themo- Contacts 32, 33, on relay 25 also close the cir- This relay is sowith preceding figures.

the record, as previously described.

With this circuit, the operator only starts the phonograph. It may stopitself by the operation of cam switch 38 controlled by motor 3I, at theend of a predetermined period, and then is automatically re-set inposition awaiting the next call.

Any other suitable time-delay device can be employed other than thatdescribed here by way of illustration.

Figure 8 shows an alternative form of operating circuit for thephonograph. Her the ringer 20 has in series with its normally closedcontacts 28, 29, a manually operated switch 62 in series in the circuitthrough the winding 63 of relay 64. A second winding 63 on this relay isconnected to line I I via the condenser 65 and contacts 66, 61, on key62. As the windings 63, and 63 are in inductive relation, the hum of thecycle current from transformer winding 5| will be reproduced in thewinding 63 and imposedon the line II, II, so that the operator plugginginto this line is immediately informed by th hum (the listening key I3being thrown) that the subscriber is not at the telephone but has thrownswitch 62 and, therefore, the phonograph is ready to receive a message.In all other respects this circuit may be like the ones previouslydescribed, the inventive concept here being the provision of the signaltone-thrown on the line'via switch key 62 (without operating the linelamp I I to notify the operator that the subscriber is away from thetelephone and the phonograph is connected to receive messages.

Figure 9, an alternate form of circuit, shows the signal tone impressedon the line via a separate coil, the winding I53 of Figure 8 beingomitted.

contact 33 in circuit across lines I I, I I with the condenser 68 and awinding 69 of a repeating coil having another winding I0 adapted toproduce a distinctive signal tone produced by any suitable means such asinterrupter H, the local circuit of which is controlled by contacts onswitch 62 as shown.

With the circuit Figure 9, when the operator plugs in the line, thesignal tone will be heard and this may be diiferent from the 60 cycltone occurring with the circuit shown in Figure 8, which tone may beconfusing to the operator, as it could be caused by induction or fromother causes.

Upon hearing the signal tone, and learning that thecalling subscriberdesires to record, the operator depresses the 66 cycle key I5 andoperates relay I9 which starts the operation,of the phonograph aspreviously described in connection When relay 25 operates the signaltonecircuit across lines II, Il is opened.

The phonograph is stopped by the operator operating ringer 20, or by thecam switch 38, as previously described.

Manual switch 62 is opened when it is not desired to use the phonograph.

Figure 10 shows an alternate form of, circuit using a commercial form ofinterlocking relay, shown within the dotted line I2 in position awaitinga call. When in this position, the subset is used in the ordinarymanner.

Upon leaving the telephone, the subscriber closes switch 13 whichcompletes a circuit from line H to line. Ila through the winding 14 ofthe signal-tone repeating coil, said winding being in inductive relationwith winding 15 containing a suitable interrupter 15 for producing thetone. Wh the operator plugs into the line, this tone willfiye heard,thereby notifying the operator that he instrument has been set torecord.

The operator now depresses key I511 thereby operating the relay l9 whichcloses its contacts momentarily, thereby completing a circuit from theA. C. source 23 through winding ll of the rev lease magnet 18 of relayI2. This draws the locking armature 19 of the right and releases theoperating armature 80. Armature 80 contacts with BI and completes acircuit from the A. C. source 23 through motor 3| of the phonograph.

Contact 82 leaves contact 83, thereby opening the circuit from line H toIla through winding 14, and re-establishing a circuit from line H viacontact 84 through the winding 34 of the repeating coil, and therecording proceeds as previously described. I

At the termination of the recording, the phonograph either stops itselfvia the action of cam switch 38 under the control of motor 3|, or theoperator stops the motor by depressing key l5 thereby operating ringerwhich closes contacts 29-41 thereby completing a circuit from the A. C.source 23 through winding This pulls armature 80 downward and same isheld down by the locking armature 19. The contacts 80-81, 82--8384, arethus operated and the circuits are restored to waiting position, asshown in the figure.

While the telephone instrument I6 is shown only in Figure 5, it will beunderstood that this telephone instrument comprises the usualtransmitter, receiver, hook-switch, induction coil, ringer 20, andcondenser 39, maybe connected across the line circuit shown in any ofthe other figures and that the talking circuits of this instrument maybe varied within wide limits.

However, it will be noted that in many installations the telephoneinstrument is portable and of the so-called French phone or Monophonetype, in which theringer is located in the cradle or base of theinstrument on which the handpiece comprising the transmitter andreceiver is supported, and in connection with the operation of thephonograph instrument, some of the circuits Figures 5 to 10 inclusive,it is necessary that the circuitts to the contacts on the ringer bebrought out of the Monophone. In Figure 5, dotted line 85 encloses theparts of the telephone instrument proper and it will be seen that a fourconductor cord is necessary in order to bring out the necessary circuitconnections. The four conductors of this cord are indicated by thenumerals 86 to 89 inclusive. Eighty-nine (89) is shown as a groundconnection for the sake of clarity, but it will be understood that itconnects to one side of the A. C. source of current 23. It will beapparent from a study of the diagram that an ordinary four conductorcord can be used and that existing sub-sets equipped with two or threeconductor cords can have their ringers equipped with contacts to operatein the manner herein described, using an ordinary four conductor cord tocomplete the circuits into the.

Monophone and that this conversion is easily done without removing thesub-set from the subscribers premises. Such telephones may, therefore,be connected without changing their external appearance, and when soconverted their regular use and portability is not impaired. They maystill be used on a table or desk in the usual manner, as they do nothave to be physically associated or positioned in any particular way inrespect to the associated phonograph.

Figure 11 shows how the sub-sets, generally indicated by the numeral 90,may be connected to the phonograph instrument, generally denoted by thenumeral 9i, the four, conductor cord 92 oi a proper length beingemployed, the phonograph instrument 9| being equipped with suitablebinding posts or terminals for the four conductors 86 to 89 inclusive ofthe cord 92 as Well as the terminals 93, 94, for the incoming telephoneline wires II and H andthe terminals 95, 96, for the line wires 30, 30leading to the local A. C. current source which may be the usual 110volt lighting circuit commonly found in residences.

It will be seen from the foregoing that the installation of a phonographto be associated with a telephone instrument is comparatively easy. Itis customary to place the two instruments within easy reach of eachother as the subscriber must manipulate the switches on the phonographinstrument such as the switch 62 and must also place record blanksthereon from time to time; although, it is obvious that the phonographinstrument 9| could be located, for example, in one room and thetelephone instrument 90 in another, the instruments being connectedtogether by suitable circuit wires, as shown in Figure 11.

While throughout this specification the phonograph has been described asused for recording only, it will be obvious that if the phonograph isequipped with a talkout record-that is to say, arranged to first delivera message before recording onethat upon the operation of the phonograph,it would first deliver to the calling Ill subscriber any message thatthe called subscriber has left on the record in the instrument, andthen, after having delivered said message, the phonograph would recordany message the calling subscriber would care to leave. Such aphonograph instrument is described in detail in the co-pendingapplication hereinbefore mentioned, and as the instant application islimited to the circuits and instrumentalities necessary to control thephonograph the construction of that instrument per se is not describedin detail.

Obviously, the ringer 20, or 29, rthe relay 64 of Figure 8, with theirassociated condensers such as 39 or 65, can be made part of thephonograph equipment 9!, in which event the conductors 88 and 89 comingout of the Monophone are dispensed with and the Monophone would have theordinary two conductor cord containing conductors 86, 8'1, in whichevent the Monophone would be equipped with an ordinary ringer and thefunctions herein described in connection with 20 or 20 would then beperformed by equivalent relays. These relays, of course, would have thenecessary resistance and impedance to be opaque to the voice currentsflowing in the telephone line and would have no effect thereon.

In the event that the ringer of the sub-set is not used to control thephonograph instrument, then obviously when a phonograph instrument isplaced alongside an existing sub-set no changes whatever need be made inthe latter as the phonograph instrument is merely bridged across,cluding said contacts, a source of current and means for operating aphonograph, a phonograph the telephone line. All of the equipmentnecessary to operate the phonograph is then mounted in one cabinet suchas that indicated at St.

What is claimed is:

1. In a telephone system having a central office, a telephone linecircuit connected thereto, a telephone instrument connected to said linecircuit, a sound device associated with said telephone instrument, meansconnected to said line circuit and controllable from said central officefor connecting said device to said line circuit, and means controllablefrom said central office associated with said device for disconnectingsame from said line circuit.

2. In a telephone system having a central office equipped with aplurality of signaling means having difiering characteristics, atelephone line connected to said office, said line having a telephoneinstrument connected thereto including signal receiving means responsiveto one of said signaling means, a sound device, means under control ofanother of said signaling means for connecting said device to said line,said device being thereafter disconn'ectable by theoperation of saidsignal receiving means.

3. In a telephone system including a central office having a pluralityof signaling means, a telephone line connected to said central ofiice,said line having a telephone instrument connected thereto, a sounddevice, means connected to said line and under the cont-r01 of one ofthe signaling means at the central ofiice for connecting said sounddevice to said telephone line, and means forming part of said telephoneinstrument for disconnecting said sound device from said line, said lastmeans being operable by another of said plurality of signaling means atsaid central ofilce.

4. In combination with a telephone line, a signaling device connectedthereto, a condenser in series with said device, a circuit controllingdevice connected to said condenser, and a sound device controlled bysaid last device.

5. In combination with a telephone line, a signaling device connectedthereto, a condenser in series with said device, a circuit controllingdevice connected to said condenser, and a sound device controlled bysaid devices.

6. In combination with a telephone line, a circuit controlling deviceconnected thereto, a condenser having a plate connected to said line andanother plate connected to said device, a second circuit controllingdevice connected to said line, a third plate in said condenser connectedto said last device, and a sound recording device controlled thereby.

7. In combination with a sub-set having a ringer, a circuit controllingdevice associated with said ringer and actuated thereby, and 'a soundrecording device having a motor serially included in circuit with asource of current and said circuit controlling device.

8. In combination with a sub-set having a ringer, a circuit and acircuit controlling device therein associated with said ringer andactuated thereby, a sound recording device having a motor seriallyincluded in circuit with a source of current and said first device, anda second circuit controlling means operable independently of said firstmeans connected to said first circuit to control the same.

9. In combination with a telephone line, means including a telephoneringer connected to said line and having contacts mechanically actuatedby the movement of said ringer, a circuit inincluding a motor drivenfrom said current source and controlled by said last means, and meanscontrolled by said phonograph for disconnecting said motor from saidcurrent source. v

10. In a telephone system, a central oiiice hav ing sub-set signalingmeans thereat, a telephone line connected to said office, a phonographconnected to said line, means adapted to be operated by said signalingmeans for starting said phonograph, and means for stopping saidphonograph including a source of current independent of said signalingmeans and operable independently thereof.

11. In a telephone system, the combination with a telephone line, of asub-set having a ringer, contacts controlled by said ringer, aphonograph instrument spaced apart from said subset, and circuitconnections extending between said sub-set and saidphonograph-instrument whereby the latter is controlled by the operationof said ringer.

12. The combination as claimed in claim 11 wherein the sub-set is of theportable type having the ringer in the base of the set, and the latteris connected to the phonograph instrument via a flexible conductingcord, whereby the subset is movable-independently of the phonographinstrument and usable independently thereof while remaining electricallyconnected thereto.

13. In a telephone system, a telephone line circuit, a phonographconnected to said line cir-- cuit, a telephone instrument connected tosaid line circuit, and means in said phonograph and telephone instrumentfor conjointly controlling the operation of said phonograph by means ofcurrent received via said telephone line circuit.

14. The combination as claimed in claim 13 wherein the means in thetelephone instrument for controlling the operation of the phonographinstrument includes a telephone ringer.

15. The combination as claimed in claim 13 wherein the means in thephonograph instrument for controlling the sameincludes a relay,the'contacts of which control the driving motor of said phonograph.

16. In a telephone system, a telephone line, a relay device connectedthereto having two separate armatures responsive to currents ofdifiering characteristics, a sub-set signal operated by one of saidarmatures, and a phonograph controlled by the operation of the otherarmature.

17. The combination as claimed .in claim 16 wherein the armatureoperating the sub-set signal also controls the operation of thephonograph.

18, Ina telephone system, a telephone line, a telephone instrumentconnected to said line, a phonograph instrument, a repeating coil havinga winding connected to said phonograph instrument, said coil having asecond winding, and means responsive to incoming current over said linefor connecting said second winding thereto.

.19. The combination as claimed in claim 18 including means responsiveto incoming current over said line for disconnecting said second windingtherefrom.

20. In combination with a telephone line, a condenser and a relay havinga winding in series with said line, a pair. of contacts adapted to beoperated by said relay, a control relay having a pair of normally opencontacts in series with said first relay contacts, said control relaycontacts adapted when closed to complete a circuit through the windingthereof, the contacts of said first relay and a source of current, athird relay and condenser in series with said line, said third relayhaving a pair of normally open contacts serially included in circuitwith said control relay winding and said source of current, and arepeating coil having a winding in series with a second pair of normallyopen contacts on said control relay and said line, and a phonographinductively coupled to said repeating coil winding.

21. In combination with a telephone line, a condenser and a relay havinga winding in series with said line, a pair of contacts adapted to beoperated by said relay, a second relay having a winding in series withsaid contacts and a source of current, a circuit including a pair ofcontacts on said second relay, a heater coil and said source of current,a pair of contacts thermostatically controlled by contacts operated bysaid heater coil, a circuit including said last contacts, said source ofcurrent and the winding of a control relay, and a phonograph controlledby contacts on said last relay.

22. In combination with a telephone line, a condenser and a relay havinga winding in series with said line, a pair of contacts adapted to beoperated by said relay, a second relay having a winding in series withsaid contacts and a source of current, a circuit including a pair ofcontacts on said second relay, a heater coil and said source of current,a pair of contacts thermostatically controlled by contacts operated bysaid heater coil, a circuit including said last contacts, said source ofcurrent and the winding of a control relay, a phonograph controlled bycontacts on said last relay, and a repeating coil having a winding inseries with said telephone line and a contact on said last relay.

23. In a telephone system having a central ffice, a telephone line, aphonograph, and means partly at said central oflice and partly at saidphonograph for physically connecting the talking circuits of saidphonograph to said line and starting the operation of said phonograph.

24. In a telephone system having a central office, a telephone line, aphonograph, means partly at said central ofiice and partly at saidphonograph for physically connecting the talking circuits of saidphonograph to said line and starting the operation of said phonograph,and means controlled by the operation of said phonograph fordisconnecting the same from said line after a predetermined timeinterval.

25. In a telephone system having a central office, a telephone line, aphonograph, means partly at said central office and partly at saidphonograph for physically connecting the talking circuits of saidphonograph to said line and starting the operation of said phonograph,and means partly at said central oifice and partly at said phonographfor stopping the phonograph and disconnecting the circuits of same fromsaid line.

26. In a telephone system having a central office and operator, atelephone line, a phonograph, and means under the control of saidoperator for physically connecting the talking circuits of saidphonograph to said line and starting the operation thereof includingtime delay means at the phonograph.

27. In a telephone system having a central oifice and operator, atelephone line, a phonograph, means under the control of said operatorfor physically connecting the talking circuits of said phonograph tosaid line and starting the operation thereof including time delay meansat the phonograph, and means controlled by the operation of saidphonograph for stopping and disconnecting the same from said line aftera predetermined time period.

28. In combination with a line circuit, a phonograph, means forconnecting said phonograph to said line circuit operable by currentflowing in said line circuit, a power circuit including a motor fordriving said phonograph controlled by said means, and means at thephonograph for impressing a signal tone on said line circuit when saidphonograph is not in operation.

29. In combination with a line circuit, a phonograph, means forconnecting said phonograph to said line circuit operable by currentflowing in said line circuit, a power circuit including a motor fordriving said phonograph controlled by said means, and means at thephonograph for impressing a signal tone on said line circuit when saidphonograph is not in operation, said last means being under the controlof said first means.

30. In combination with a line circuit, a phonograph, means forconnecting said phonograph to said line circuit operable by currentflowing in said line circuit, a power circuit including a motor fordriving said phonograph controlled by said means, means at thephonograph for impressing a signal tone on said line circuit when saidphonograph is not in operation, and means for disconnecting saidphonograph from said line and connecting said signal tone thereto.

31. In combination, an interlocking relay having an actuating windingand a release winding and having an operating armature and a holdingarmature, a source of current connected to both said windings, contactsadapted to be actuated by said operating armature when said actuatingwinding is energized, control means in circuit with said current sourceand said actuating winding for completing a circuit to cause saidwinding to operate said contacts, a repeating coil. a first circuitserially including a line circuit. some of said contacts and a windingof said coil, a second circuit including other of said contacts and amotor, means for actuating said control means including current flowingin said line circuit to cause said actuating armature to move therebyoperating said contacts, said armature being held locked, once currenthas been applied to its coil, said first and second circuits being heldopen by said contacts when said armature is in locked position, a secondcontrol means serially included in circuit with said source of currentand said release winding, and means for actuating said second controlmeans to close a circuit through said release winding and withdraw saidholding armature to release and permit said operating armature to closethe contacts in said first and second circuits,

32. The combination as claimed in claim 31 wherein said operatingarmature acts to close contacts and establish a signal tone circuit toimpress a signal tone on the lin circuit when the contact controllingsaid first and second circuits are open.

33. In combination, a line circuit, a control relay having a windingconnected to said line circuit, contacts on said relay adapted tocontrol a motor circuit, a second winding in inductive relation to saidfirst winding, means for impressing a signal tone on said secondwinding, a second control relay having a winding connected to said line,and contacts on said last relay for controlling said signal tone.

HARRY R. VAN DEVENTER.

